Cadillac Q&A

I have a 1990 De ville and the a/c unit needs to be recharged.The system runs but no hot air comes from the vents. I have no leaks. last year the heat worked fine with the exception that it wasn't very hot. Now I have no heat only cold air. Fuse(s) are good and I don't have a clue as to what's the matter, could someone assist me in getting heat?

a/c low charge has nothing to do with your heat. check your coolant levels. also monitor your vehicles operating tempature. if it never gets to normal operating tempature you might have thermostat issues.